const mapTools = (function () {
    const x_pi = (3.14159265358979324 * 3000.0) / 180.0;

    var pi = 3.14159265358979324;
    var a = 6378245.0;
    var ee = 0.00669342162296594323;

    var LLBAND = [75, 60, 45, 30, 15, 0];
    var LL2MC = [
        [
            -0.0015702102444, 111320.7020616939, 1704480524535203, -10338987376042340,
            26112667856603880, -35149669176653700, 26595700718403920,
            -10725012454188240, 1800819912950474, 82.5,
        ],
        [
            0.0008277824516172526, 111320.7020463578, 647795574.6671607,
            -4082003173.641316, 10774905663.51142, -15171875531.51559,
            12053065338.62167, -5124939663.577472, 913311935.9512032, 67.5,
        ],
        [
            0.00337398766765, 111320.7020202162, 4481351.045890365,
            -23393751.19931662, 79682215.47186455, -115964993.2797253,
            97236711.15602145, -43661946.33752821, 8477230.501135234, 52.5,
        ],
        [
            0.00220636496208, 111320.7020209128, 51751.86112841131, 3796837.749470245,
            992013.7397791013, -1221952.21711287, 1340652.697009075,
            -620943.6990984312, 144416.9293806241, 37.5,
        ],
        [
            -0.0003441963504368392, 111320.7020576856, 278.2353980772752,
            2485758.690035394, 6070.750963243378, 54821.18345352118,
            9540.606633304236, -2710.55326746645, 1405.483844121726, 22.5,
        ],
        [
            -0.0003218135878613132, 111320.7020701615, 0.00369383431289,
            823725.6402795718, 0.46104986909093, 2351.343141331292, 1.58060784298199,
            8.77738589078284, 0.37238884252424, 7.45,
        ],
    ];
    var MCBAND = [12890594.86, 8362377.87, 5591021, 3481989.83, 1678043.12, 0];
    var MC2LL = [
        [
            1.410526172116255e-8, 0.00000898305509648872, -1.9939833816331,
            200.9824383106796, -187.2403703815547, 91.6087516669843,
            -23.38765649603339, 2.57121317296198, -0.03801003308653, 17337981.2,
        ],
        [
            -7.435856389565537e-9, 0.000008983055097726239, -0.78625201886289,
            96.32687599759846, -1.85204757529826, -59.36935905485877,
            47.40033549296737, -16.50741931063887, 2.28786674699375, 10260144.86,
        ],
        [
            -3.030883460898826e-8, 0.00000898305509983578, 0.30071316287616,
            59.74293618442277, 7.357984074871, -25.38371002664745, 13.45380521110908,
            -3.29883767235584, 0.32710905363475, 6856817.37,
        ],
        [
            -1.981981304930552e-8, 0.000008983055099779535, 0.03278182852591,
            40.31678527705744, 0.65659298677277, -4.44255534477492, 0.85341911805263,
            0.12923347998204, -0.04625736007561, 4482777.06,
        ],
        [
            3.09191371068437e-9, 0.000008983055096812155, 0.00006995724062,
            23.10934304144901, -0.00023663490511, -0.6321817810242, -0.00663494467273,
            0.03430082397953, -0.00466043876332, 2555164.4,
        ],
        [
            2.890871144776878e-9, 0.000008983055095805407, -3.068298e-8,
            7.47137025468032, -0.00000353937994, -0.02145144861037, -0.00001234426596,
            0.00010322952773, -0.00000323890364, 826088.5,
        ],
    ];

    function getRange(cC, cB, T) {
        if (cB != null) {
            cC = Math.max(cC, cB);
        }
        if (T != null) {
            cC = Math.min(cC, T);
        }
        return cC;
    }
    function getLoop(cC, cB, T) {
        while (cC > T) {
            cC -= T - cB;
        }
        while (cC < cB) {
            cC += T - cB;
        }
        return cC;
    }
    function convertor(cC, cD) {
        if (!cC || !cD) {
            return null;
        }
        let T = cD[0] + cD[1] * Math.abs(cC.x);
        const cB = Math.abs(cC.y) / cD[9];
        let cE =
            cD[2] +
            cD[3] * cB +
            cD[4] * cB * cB +
            cD[5] * cB * cB * cB +
            cD[6] * cB * cB * cB * cB +
            cD[7] * cB * cB * cB * cB * cB +
            cD[8] * cB * cB * cB * cB * cB * cB;
        T *= cC.x < 0 ? -1 : 1;
        cE *= cC.y < 0 ? -1 : 1;
        return [T, cE];
    }

    /**
     * 百度墨卡托坐标转百度经纬度坐标：
     * @param {*} cB
     * @returns
     */
    function convertBdMC2LL(lnglat) {
        const cB = {
            x: lnglat.lng,
            y: lnglat.lat,
        };
        const cC = {
            x: Math.abs(cB.x),
            y: Math.abs(cB.y),
        };
        let cE;
        for (let cD = 0, len = MCBAND.length; cD < len; cD++) {
            if (cC.y >= MCBAND[cD]) {
                cE = MC2LL[cD];
                break;
            }
        }
        const T = convertor(cB, cE);
        return T;
    }

    /**
     * 百度BD09经纬度坐标转百度墨卡托坐标：
     * @param {*} T
     * @returns
     */
    function convertBdLL2MC(lnglat) {
        const T = {
            x: lnglat.lng,
            y: lnglat.lat,
        };
        let cD, cC, len;
        T.x = getLoop(T.x, -180, 180);
        T.y = getRange(T.y, -74, 74);
        const cB = T;
        for (cC = 0, len = LLBAND.length; cC < len; cC++) {
            if (cB.y >= LLBAND[cC]) {
                cD = LL2MC[cC];
                break;
            }
        }
        if (!cD) {
            for (cC = LLBAND.length - 1; cC >= 0; cC--) {
                if (cB.y <= -LLBAND[cC]) {
                    cD = LL2MC[cC];
                    break;
                }
            }
        }
        const cE = convertor(T, cD);
        // return cE;
        return {
            lng: cE[0],
            lat: cE[1],
        };
    }

    /*判断是否在国内，不在国内则不做偏移*/
    function outOfChina(lon, lat) {
        if ((lon < 72.004 || lon > 137.8347) && (lat < 0.8293 || lat > 55.8271)) {
            return true;
        } else {
            return false;
        }
    }
    function transformLat(x, y) {
        var ret =
            -100.0 +
            2.0 * x +
            3.0 * y +
            0.2 * y * y +
            0.1 * x * y +
            0.2 * Math.sqrt(Math.abs(x));
        ret +=
            ((20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0) /
            3.0;
        ret +=
            ((20.0 * Math.sin(y * pi) + 40.0 * Math.sin((y / 3.0) * pi)) * 2.0) / 3.0;
        ret +=
            ((160.0 * Math.sin((y / 12.0) * pi) + 320 * Math.sin((y * pi) / 30.0)) *
                2.0) /
            3.0;
        return ret;
    }

    function transformLon(x, y) {
        var ret =
            300.0 +
            x +
            2.0 * y +
            0.1 * x * x +
            0.1 * x * y +
            0.1 * Math.sqrt(Math.abs(x));
        ret +=
            ((20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0) /
            3.0;
        ret +=
            ((20.0 * Math.sin(x * pi) + 40.0 * Math.sin((x / 3.0) * pi)) * 2.0) / 3.0;
        ret +=
            ((150.0 * Math.sin((x / 12.0) * pi) + 300.0 * Math.sin((x / 30.0) * pi)) *
                2.0) /
            3.0;
        return ret;
    }
    function delta(lat, lon) {
        let a = 6378245.0; //  a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
        let ee = 0.00669342162296594323; //  ee: 椭球的偏心率。
        let dLat = transformLat(lon - 105.0, lat - 35.0);
        let dLon = transformLon(lon - 105.0, lat - 35.0);
        let radLat = (lat / 180.0) * pi;
        let magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        let sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / (((a * (1 - ee)) / (magic * sqrtMagic)) * pi);
        dLon = (dLon * 180.0) / ((a / sqrtMagic) * Math.cos(radLat) * pi);
        return {
            lat: dLat,
            lon: dLon,
        };
    }

    // 地球坐标系(WGS-84)转火星坐标系(GCJ)：
    function transformWGS2GCJ(lnglat) {
        const wgLat = lnglat.lat;
        const wgLon = lnglat.lng;
        var mars_point = {};
        if (outOfChina(wgLon, wgLat)) {
            mars_point.lat = wgLat;
            mars_point.lon = wgLon;
            return;
        }
        var dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
        var dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
        var radLat = (wgLat / 180.0) * pi;
        var magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        var sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / (((a * (1 - ee)) / (magic * sqrtMagic)) * pi);
        dLon = (dLon * 180.0) / ((a / sqrtMagic) * Math.cos(radLat) * pi);
        mars_point.lat = wgLat + dLat;
        mars_point.lng = wgLon + dLon;
        return mars_point;
    }

    // 火星坐标系GCJ02转地球坐标系WGS84：
    function transformGCJ2WGS(lnglat) {
        const gcjLat = lnglat.lat;
        const gcjLon = lnglat.lng;
        let d = delta(gcjLat, gcjLon);
        return {
            lat: gcjLat - d.lat,
            lng: gcjLon - d.lon,
        };
    }

    /**
     * 百度坐标转火星坐标：
     * @param {*} baidu_point
     * @returns
     */
    function baiduTomars(baidu_point) {
        var mars_point = { lng: 0, lat: 0 };
        var x = baidu_point.lng - 0.0065;
        var y = baidu_point.lat - 0.006;
        var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
        var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
        mars_point.lng = z * Math.cos(theta);
        mars_point.lat = z * Math.sin(theta);
        return mars_point;
    }

    /**
     * 火星坐标转百度坐标：
     * @param {*} mars_point
     * @returns
     */
    function marsTobaidu(mars_point) {
        var baidu_point = { lng: 0, lat: 0 };
        var x = mars_point.lng;
        var y = mars_point.lat;
        var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
        var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
        baidu_point.lng = z * Math.cos(theta) + 0.0065;
        baidu_point.lat = z * Math.sin(theta) + 0.006;
        return baidu_point;
    }
    // 测试百度和火星坐标系的转换
    function testBaiduMars() {
        const lng = 116.01965;
        const lat = 40.043425;
        const lnglat = {
            lng,
            lat,
        };
        let result;
        result = mapTools.baiduTomars(lnglat);
        console.log(result); // { lng: 116.01318467451765, lat: 40.037373017166615 }
        result = mapTools.marsTobaidu(result);
        console.log(result);
    }
    // 测试火星坐标系和WGS 相互转换
    function testWGSMars() {
        const lng = 116.01965;
        const lat = 40.043425;
        const lnglat = {
            lng,
            lat,
        };
        let result;
        result = mapTools.transformWGS2GCJ(lnglat); // 地球坐标系(WGS-84)转火星坐标系(GCJ)：
        console.log(result); // { lng: 116.01318467451765, lat: 40.037373017166615 }
        result = mapTools.transformGCJ2WGS(result);
        console.log(result);
    }

    // 测试百度经纬度和墨卡托坐标的相互转换
    function testBdMC2LL() {
        const lng = 116.01965;
        const lat = 40.043425;
        const lnglat = {
            lng,
            lat,
        };
        let result;
        result = mapTools.convertBdLL2MC(lnglat); // 地球坐标系(WGS-84)转火星坐标系(GCJ)：
        console.log(result); // { lng: 116.01318467451765, lat: 40.037373017166615 }
        result = mapTools.convertBdMC2LL(result);
        console.log(result);
    }

    return {
        test: {
            testBaiduMars, // 百度经纬度和GCJ坐标系的相互转换
            testWGSMars, // WGS84 和 GCJ 坐标系的转换
            testBdMC2LL //测试百度经纬度和墨卡托坐标的相互转换
        },
        convertBdMC2LL, // 百度墨卡托坐标转百度经纬度坐标：
        convertBdLL2MC, // 百度BD09经纬度坐标转百度墨卡托坐标：
        transformWGS2GCJ, // 地球坐标系(WGS-84)转火星坐标系(GCJ)：
        transformGCJ2WGS, // 火星坐标系GCJ02转地球坐标系WGS84：
        baiduTomars, // 百度坐标转火星坐标：
        marsTobaidu, // 火星坐标转百度坐标：
    };
})();
// mapTools.test.testBaiduMars()
// mapTools.test.testWGSMars()
// mapTools.test.testBdMC2LL()

export default mapTools
